Abstract: Taking instrument landing system (ILS) and established on required navigation performance authorization required (RNP AR) (EoR) mixed approach procedure as the research object, the runway approach capacity under
the mixed approach is discussed. Firstly the aircraft wake dissipation and movement law are studied, and a safety
distance calculation method is proposed under mixed approach conditions. And then the approach capacity model of mixed approach parallel runway is established according to the characteristics of mixed approach operation.
Finally, taking Kunming Changshui International Airport as an example, total airspace and airport simulation
model is established to verify this model. On this basis, various operational scenarios are set up to analyze the
factors affecting the runway approach capacity under the mixed approach conditions, including procedure struc鄄
ture, type of aircraft and aircraft proportion of RNP AR capability. The results show that the capacity evaluation
model can evaluate the approach capacity of parallel runway under mixed approach operation accurately and objectively. And the larger the segment radius of constant radius to fix (RF), the greater of the runway approach capacity. When the RF segment radius is 4-7 km, the aircraft proportion of RNP AR capability is higher, the runway
approach capacity is larger. And the proportion of medium-sized aircraft is higher, the greater of the runway approach capacity is greater.

Key words: mixed approach, safety distance, capacity evaluation, total airspace and airport modeler (TAAM) simulation